Aetiology

Environmental factors

Although the idea that certain foods or food additives might cause ADHD has received a lot of attention in the media, it is clear that this theory is now wrong.1

Other non-genetic factors that have been implicated in the pathophysiology of ADHD include:1,2

However, these environmental factors are thought to account for only 20–30% of the incidence of ADHD in boys and less in girls.2

References:
1. Biederman J, Faraone SV. Attention-deficit hyperactivity disorder. Lancet 2005; 366: 237–48.
2. Barkley RA. Attention-deficit hyperactivity disorder. Sci Am 1998; 279: 66–71.

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